I have attached two pages from the Load and Resistance Factor Design Manual, Second Edition from around 98. I have a question on when Cb>1. They show two formulas for Lm. They have a condition for Lm to decide which formula to use, but I don't know how to apply to the condition unless I have plugged into an Lm formula.
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Question on Lm in Steel beams using LRFD
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